User's Manual

Table Of Contents

GS2101M Low Power WiFi Module Data Sheet Pin-out and Signal Description

GS2101Mxx Device Pin-out

GS2101M-DS-001270, Release 1.0 Confidential 41

3.1.3 GS2101M Program and Code Restore Options

Table 9, page 41 describes the options available for device program mode and code restore

capabilities. The respective GPIO pins are sampled at reset by device and depending on the

values seen on these pins goes into the appropriate mode. Code for the GS2101M resides

on the internal flash of the module and up to two back-up copies could be stored in flash.

If a software designer wants to restore the execution code to one of the backup copy, it can

be accomplished by asserting the appropriate GPIO pins as shown in the table below during

power up or reset.

Note:

1. In Run Mode, boot ROM leaves all GPIO pins as input with pull resistor enabled until flash

code sets them otherwise. In Program Mode, only the pins required for the Program Mode

specified interfaces are set to non-GPIO mode.

Table 9 GS2101M Pin Program and Code Restore

Boot Control Program

Mode

(GPIO 31)

Program

Select/Previous

Restore

(GPIO 25)

Interfaces for Program Load

(see Note 1) 0 0 Normal boot

Previous Code Restore. Restores the prior code revision by

invalidating the present code image. Will NOT invalidate the

last remaining image.

Program Mode: UART0 @ 115.2Kbaud; nothing on

GPIO15-18; SPI0 on SDIO pins. Note: this is the default you

get if you don’t pull the Program Select pin high.

Program Mode using: UART0 @921.6Kbaud; SPI0 on

GPIO15-18. Note: GPIO15-18 are only available on GS2000

SoC, and not on modules.